/Engine/Plugins/Experimental/MeshModelingToolsetExp/Source/MeshModelingToolsExp/Public/MeshSelectionTool.h
Disconnected the selected triangles from their neighbours, to create mesh boundaries along the selection borders
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(CallInEditor, Category=MeshEdits, Meta=(DisplayName="Disconnect", DisplayPriority=3)) void Disconnect()